Combine milk and white vinegar in a mixing bowl, and set aside for 5 minutes for liquid to sour.

Put flour, sugar, baking powder, baking soda, and salt in a large mixing bowl. Whisk egg and melted butter into the bowl of “soured” milk. Pour the dry ingredients into the wet ingredients and whisk until lumps are smoothed.

Meanwhile, slowly heat a large heavy skillet over medium heat for a few minutes, and spritz with cooking spray. Pour 1/4 cup of batter onto the sizzling skillet, and cook until bubbles appear on the surface of the pancake. Flip with a spatula, and cook until browned on the other side.

Top with butter and maple syrup, diced fresh fruit, and/or sprinkle with flavored sugar, if desired, before serving.